Weft feed mechanism



Jan. 16, 1968 P. P. Jozus WEFT FEED MECHANISM '7 Sheets-Sheet 1 FiledOct. 22, 1965 INVENTOR. PETERS P. JOZUS ATTORNEYS Jan. 16, 1968 P. P.JOZUS WEFT FEED MECHANISM 7 Sheets-Sheet 2 Filed Oct. 22, 1965 INVENTOR.PETERS P. JOZUS ATTORNEYS Jan. 16, 1968 P. P. JOZUS 3,363,654

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ATTOR NEYS United States Patent 3,363,654 WEFT FEED MECHANISM Peters P.Jozus, 397 Prospect Ave., West Hartford, Conn. 06105 Filed Oct. 22,1965, Ser. No. 502,004 12 Claims. (Cl. 139-141) ABSTRACT OF THEDISCLOSURE A loom having a shuttle operating mechanism which comprises apair of oppositely extending flexible bands helically wound uponsupporting drums which are timely driven to transfer the shuttle backand forth through the shed of the loom. Shuttle connectors mounted atthe outer ends of the flexible bands for receiving the shuttle haveelectromagnetically controlled latches for retaining the shuttle. Asecond drum is mounted parallel to each supporting drum for winding andunwinding a retaining band in overlapping relationship with the flexibleband, and these cooperating drums are driven together by a leverconnected to an endless driving link and a lever operating cam such thatthe shuttle is transferred within the shed from one of the flexible bandconnectors to the other connector smoothly and at substantially aconstant velocity during the transfer interval.

The present invention relates to the feeding of weft threads through theshed of a loom and more particularly to an improved weft feed mechanismhaving notable utility in looms of the type employing shuttles forfeeding the weft through the shed.

It is a principal aim of the present invention to provide a new andimproved mechanism for transferring a shuttle through the shed whichprovides for rapid and smooth shuttle movement and which is adapted totransfer the shuttle through the shed without excessive acceleration ordeceleration of the shuttle.

It is another aim of the present invention to provide a new and improvedshuttle operating mechanism which is adapted to provide for optimumacceleration of the shuttle at the beginning of its path of travel, foroptimum shuttle velocity through the shed and for optimum decelerationof the shuttle at the end of its path of travel.

It is a further aim of the present invention to provide a weft feedmechanism which provides for increasing the loom weaving speed byincreasing the speed and reliability of the weft feed.

It is another aim of the present invention to provide a shuttleoperating mechanism which can be installed on conventional looms withoutexpensive modification of the looms and which at the same time providesfor operating the loom with greater reliability and without the noiseaccompanying the usual picker stick drive mechanisms.

It is another aim of the present invention to provide a new and improvedweft feed mechanism of the type adapted for transferring the weft threadthrough the shed with a pair of arms reciprocable inwardly from oppositeends of the shed to meet at substantially the center of the shed wherethe weft thread is transferred from one of the arms to the other andwhereupon the arms are retracted to complete the weft feed cycle beforethe warp threads of the shed are reversed to reform the shed for thefollowing weft feed stroke.

It is a further aim of the present invention to provide an improvedshuttle operating mechanism which provides for positively driving theshuttle through the shed with an acceleration, deceleration and maximumspeed that is efiectively controlled within the operational limits ofthe loom and the practical limitations placed upon the operation of theloom by the material which is being woven.

It is another aim of the present invention to provide a new and improvedshuttle operating mechanism for a loom which enables the loom to bestarted at any point in the shuttle operating cycle and to be operatedat diiferent speeds without adjustment or alteration of the shuttleoperating mechanism.

It is another aim of the present invention to provide an improvedshuttle operating mechanism of the type employing reciprocable arms fortransferring the shuttle through the shed which is useful withconventional looms without substantially increasing the transversedimension of the loom.

It is a further aim of the present invention to provide a weft feedmechanism which provides for feeding the weft through the shed inaccordance with the weft thread employed and the material to be woven.

Other objects will be in part obvious and in part pointed out more indetail hereinafter.

The invention accordingly consists in the features of construction,combination of elements and arrangements of parts which will beexemplified in the construction hereafter set forth, and the scope ofthe application of which will be indicated in the appended claims.

In the drawings.

FIG. 1 is an elevation view showing one side of a loom incorporating anembodiment of a weft feed mechanism of the present invention whichemploys a shuttle for feeding the weft through the shed of the loom;

FIG. 2 is a partial side elevation view, partly broken away, showing theother side of the loom of FIG. 1;

FIG. 3 is a front elevation view of the loom;

FIG. 4 is a top plan view, pantly broken away, of the loom;

FIG. 5 is an enlarged front elevation view, partly broken away, showinga shuttle operating mechanism of the loom;

FIG. 6 is a section view, partly broken away and partly in section,taken substantially along line 6-6 of FIG. 5;

FIG. 7 is a section view, partly broken away and partly in section,taken substantially along line 77 of FIG. 5;

FIG. 8 is a section view, pantly broken away and partly in section,taken substantially along line 88 of FIG. 7;

FIG. 9 is a view partly broken away showing a partial enlargement of theview of FIG. 8 and additionally showing a transverse section view of atransfer band employed in the shuttle operating mechanism;

FIG. 10 is an enlarged plan view, partly broken away and partly insection, showing a shuttle transfer arm of the shuttle operatingmechanism in driving connection with the loom shuttle;

FIG. 11 is an elevation section view, partly broken away and partly insection, taken substantially along line 1111 of FIG. 10; and

FIG. 12 is a chart showing theshuttle motion during f a completeoperating cycle of the loom.

Referring now to the drawings in detail, a loom incorporating a shuttleoperating mechanism employing the present invention is shown comprisinga drive motor 10, a transversely extending crankshaft 12 driven by thedrive motor through suitable reduction gearing including the gears 14,16 (FIG. 4) and a bottom shaft 20 which is driven by the crankshaftthrough the reduction gearing 22, 24 to provide a 2:1 speed reduction sothat the crankshaft rotates two revolutions for each revolution of thebottom shaft 20.

A lay, generally denoted by the numeral 40, is pivotally mounted on theloom frame on a transversely extending rocker shaft 41 by a pair ofelongated layswords 42, and the crankshaft 12. is connected to the lay40 by a crank connecting arm 44 for pivotal operation of the lay in thewell-known manner. The shed 50 of the loom is shown formed in theconventional way by a harness 52. The harness 52 is connected to thetreadles 58, and the treadles 58 are pivotally operated by a pair ofcams 59 mounted on the bottom shaft 20 so that the warp threads arealternately raised and lowered by the harness to form the shed in timedrelationship with the pivotal operation of the lay. The warp threads arefed from a warp beam 60 over the whip roll 62 to the harness 52, and thewoven fabric is fed over the breast beam 64, partially around a takeupdrum 66 and by a takeup mechanism 74 onto cloth roll 72.

The lay 40 comprises a shuttle race plate 80 for assisting in supportingthe shuttle 82 as it is driven through the shed between the shuttleboxes 84, 86 at the transverse ends of the lay. The shuttle 82 is shownprovided in a conventional manner with a central cavity for supporting abobbin 88 which carries the weft threads and which in the known mannerpays out the weft thread as the shuttle is advanced through the shed.

In accordance with the present invention, a shuttle operating mechanismis provided for advancing the shuttle positively and accurately throughthe shed in timed relationship with the cyclical operation of theharness 52 and the lay 40. This operating mechanism comprises a pair ofshuttle transfer mechanisms, generally denoted by the numeral 100, whichare mounted for pivotal movement with the lay and in line with theshuttle race plate outwardly of the shuttle boxes 84, 86. The shuttletransfer mechanisms 100 are of like construction and cornprise a boxlikeframe 102 and a pair of spaced parallel reels or drums 104, 106 ofpreferably equal diameter and whose axes are preferably generallyparallel to but inclined slightly forwardly toward the longitudinal axisof the loom, as seen in FIG. 4. The reels 104, 106 are suitably keyed totheir parallel supporting shafts 108, 110 and the shafts are connectedby suitable gears 112, 114, respectively, to provide equal and oppositerotation of the reels 104, 106. A pair of externally threaded sleeves116, 118 secured on shafts 108, 110, respectively, are mounted forthreaded engagement with fixed internally threaded sleeves 224 so thatreels 104, 106 are axially shafted back and forth within the frame 102as they are rotated in opposite angular directions.

The reels 104, 106 are provided with peripheral helical flanges 110, 120and metal bands 122, 124 having their inner ends secured to the reels bypins 126-, 127 mounted within peripheral recesses in the drums as shownin FIG. 9 are wound hedically about the drums within the helical slotsformed by the flanges 119, 120. The pposite end of the band 122 issecured to the pin 127 of the lower reel and is also wound upon the reel106 in overlying relationship with the band 124. The lower band 124 isadapted to be paid out from the reel 106 as the reel is rotated in thecounterclockwise direction, as viewed in FIGS. 8 and 9. Also, as seen inFIG. 7, the helical slots formed by the flanges 119, 120 are of oppositehand and the bands 122, 124 are wound upon the reels so that as thereels are rotated in opposite angular directions the bands are unwoundand wound onto the reel 106 in overlying relationship. The band 122therefore acts as a retainer for the band 124 to keep the band 124 tauton the reel 106 as it is payed out tangentially from the reel andsubsequently rewound upon the reel when it is rotated in the oppositedirection. Two pairs of horizontally and vertically extending rollers132, 134 are provided for guiding the band 124 outwardly in line withthe path of travel of the shuttle, and it is for this reason that theaxes of the drums are inclined to the longitudinal axis of the loom andthe drums are axially shifted so that the band 124 is payed out from thedrum and rewound on the drum while it remains in line with the path oftravel of the shuttle. Also, for maintaining the rigidity of the outerend of the band 124 as it is payed out from the reel 106, the band 124is preformed to assume an arcuate shape as shown in FIG. 9. When,however, the band 124 is rewound upon the reel 106, it is flattenedagainst the cylindrical surface of the reel 106 by the overlying band122.

Referring to FIGS. 10 and 11, a shuttle connector 136 is mounted on theouter end of the metal band 124 for transferring the shuttle along thelay race plate and through the shed. The connector 136 is shown havingan inwardly tapered opening 138 which provides a socket of a suitabledimension for receiving the longitudinal end of the shuttle 82, shownpointed in the known manner for facilitating the passage of the shuttlethrough the shed. The shuttle end is preferably provided with a throughopening 140 and the connector 136 is provided with a pivotal latch pawl142 having an arm 144 receivable in the opening 140 for securelyretaining the shuttle in the socket 138 and for maintaining the shuttlein longitudinal alignment with the metal band 124. For this reason thelatch arm 144 has a concave inner face 146 and the opening 140 isprovided with a conforming convex face 148.

The latch pawl 142 is in part retained in its locking position, shown infull lines in FIG. 10, by a leaf spring 150 which engages a flat edge152 of the pawl. Also, the pivotal latch pawl 142 is retained in itsrelease position, shown in broken lines in FIG. 10, by the engagement ofthe leaf spring 150 with a flat edge 154 of the pawl. For assisting inretaining the pawl 142 in its locking position and accordingly forretaining the shuttle 32 within the socket 138 when the band 124 andconnector 136 are functioning to withdraw the shuttle from the shed, theconnector 136 is provided with an electromagnet 156 and the pivotal pawl142 is provided with a second arm 158 which functions as an armature forthe electromagnet. Also, of course, the electromagnet provides forurging the latch pawl 142 from its release position to its lockingposition; however, it is preferred that the spring bias is sufficient toretain the latch pawl in its release position until the end of theshuttle strikes the arm 158, as seen in broken lines in FIG. 10, topivot the latch pawl into contact with the electromagnet. Thus, eventhough the electromagnet is energized, the latch pawl will remain in itsrelease position until the shuttle is inserted within the opening 138.

The shuttle transfer mechanisms 100 thus provide a pair of reciprocabletransfer arms comprising the metal bands 124 and the shuttle connectors136 for transferring the shuttle back and forth through the shed. Also,by properly energizing and tie-energizing the electromagnets 156 of theconnectors 136, for example with a rotary switch plate 160 (FIG. 2)mounted on the bottom shaft 20, the electromagnets 156 can be timelyenergized and de-energized with the reciprocable movement of the shuttleand in accordance with the timely transfer of the shuttle from onetransfer arm to the other. In this regard, it is preferred that theelectromagnet 156 of the receiving arm be energized and theelectromagnet of the transferring arm be tie-energized prior to theactual transfer so that the trans-fer is timely and effective.

Referring to FIGS. 7, 8 and 9, the leads 161, 162 to the electromagnetare shown mounted on the underside of the band 124 and therefore withinthe concavity of the portion of the band paid out from the reel. Also,the reel 106 is preferably provided with a helical slot 163 forreceiving the leads when the band 124 is wound upon the reel. The reel106 is also shown provided with a radial opening 165 and the shaft 110is provided with an axial opening 164 for connecting the leads to thecircuitry including the rotary switch plate 160.

For simultaneously oscillating the reels 106 in timely sequence with theformation of the shed and with the pivotal movement of the lay, thereels 106 are driven with an endless link 170 having a chain portion 172mounted on a sprocket 174 fixed to the shaft 110 and a cable or cordportion 176 mounted on a pulley 180 and two pairs of intermediate guidepulleys 182, 184, respectively. As best seen in FIGS. 1, 2 and 3 thepulley 180 is mounted on the loom frame, the pulleys 182 are mounted onthe rocker shaft 41 and the pair of pulleys 184 are mounted on suitablearms 185 fixed for pivotal operation with the rocker shaft 41. As aresult, the lay 40 and therefore the sprocket 174 can be oscillatedwithout unduly affecting the tension in the endless drive link 170.

A drive arm 190 is employed for driving the endless link 170. One end ofthe drive arm 190 is pivotally connected to the cable 176 with asuitable connector 192 and the other end is pivotally connected to theframe with a suitable connector 194. A control cam 198 is mounted on thebottom shaft 20 for pivotal operation of the drive arm 190 and isprovided with a cam slot or groove 200 which receives a follower 202mounted on the drive arm 190. Although the cam slot 200 is specificallydesigned to provide cooperative reciprocating movement of the transferarms as hereinafter described, minor adjustments can be made byadjustment of the effective length of the drive arm 190 and theintermediate position of the follower 202, for which purpose the drivearm 190 is provided with slots 204, 205, 206 for longitudinal adjustmentof the connectors 192, 194 and the follower 202.

Referring now to FIG, 12, a diagram is shown having a pair of lines 222,225 which represent the movement of the transfer arms during a complete360 cycle of the loom (or one complete rotation of the bottom shaft 20)during which the shuttle 82, shown in broken lines in FIG. 12, istransported from one of the shuttle boxes to the other shuttle box, andreturned to the first shuttle box by the transfer arms.

Also, it can be seen by this diagram that the transfer arms arereciprocated in out-of-phase relationship with each other so that thereceiving arm reaches the apex 210 of its outward movement before thetransferring arm reaches its apex 212 and the receiving arm is in itsretracting phase when it receives the shuttle. Thus, as seen in FIG. 12,the shuttle 82 can be transferred without decreasing its speed of travelthrough the shed. Also, by controlled operation of the transfer arms,the shuttle is accelerated at an optimum rate from the shuttle box atthe beginning of the shuttle transfer and decelerated at an optimum rateat the end of the shuttle transfer. Further, the inactive transfer armmay be withdrawn, as shown in FIG. 12, just enough to clear the shed andwith the arm positioned in the shuttle box as seen at 214 in FIG. 12.

It can be seen that during each revolution of the shuttle course, thecontrol cams are rotated together by the bot tom shaft 20 and areangularly related on the shaft 20 so that the cam portion 215 of one camis active while the cam portion 216 of the other cam is active.Andlikewise, the cam portion 218 of one cam is active while the camportion 220 of the other cam is active.

The control cams can be readily replaced in order to vary theacceleration and deceleration and the maximum speed of the shuttle inaccordance with the weft thread used and the type of weave desired. Thusfor any given weave, material, and loom operating speed, control camsproviding optimum shuttle movement can be readily installed. Also, withthe weft feed mechanism of the present invention, the weft thread may bereliably and effectively fed through the shed in timed relationship withthe formation of the shed. Moreover, the weft feed mechanism of thepresent invention may be readily installed in con ventional looms withminimum reconstruction and expense and without substantially increasingthe over-all width of the loom. Further, with the shuttle transfermechanism of the present invention and the novel latching deviceemployed therein, the shuttle may be quickly and reliably transferredfrom one of the transfer arms to the other without requiring accurateenergization and deenergization of the associated electromagnet.

As will be apparent to persons skilled in the art, various modificationsand adaptations of the structure above described Will become readilyapparent without departure from the spirit and scope of the invention,the scope of which is defined in the appended claims.

I claim:

1. In a loom having a pair of transversely spaced shuttle drivemechanisms with transversely extending drive arms adapted for beingreciprocated for extension into and withdrawal from the shed of the loomto drive a shuttle back and forth through the shed, the arms functioningalternately as shuttle transferring and shuttle receiving arms fortransferring the shuttle back and forth therebetween as they arereciprocated, and drive means for reciprocating the arms in timelyrelationship for driving the shuttle back and forth through the shed andfor timely transferring the shuttle from the transferring arm to thereceiving arm, the improvement wherein the drive mechanism comprises arotatable reel, a flexible band forming the drive arm helically woundonto the reel and adapted to be extended into the shed by rotation ofthe reel in one angular direction and to be Withdrawn from the shed byrotation of the reel in the opposite angular direction, and wherein thedrive means provides for rotating the reels in synchronism for drivingthe shuttle back and forth through the shed of the loom and for axiallyreciprocating the reels in synchronism with the rotation thereof forhelically winding the flexible bands onto and unwinding the bands fromthe reels.

2. The improvement of claim 1 wherein the flexible band assumes anarcuate transverse shape when unwound from the reel to providesufiicient rigidity for driving the shuttle back and forth through theshed of the loom.

3. The improvement of claim 1 wherein the drive means provides forrotating the reels so that the receiving arm has reached its fullyextended position and is being withdrawn from the shed and thetransferring arm is still being extended as the shuttle is transferredbetween the arms.

4. The improvement of claim 3 wherein the drive means provides forrotating the reels so that the shuttle is transferred from thetransferring arm to the receiving arm at a substantially constantvelocity.

5. In a loom having a pair of transversely spaced shuttle drivemechanisms with transversely extending drive arms adapted for beinreciprocated for extension into and withdrawal from the shed of the loomto drive a shuttle back and forth through the shed, the arms functioningalternately as shuttle transferring and shuttle receiving arms fortransferring the shuttle back and forth therebetween as they arereciprocated, and drive means for reciprocating the arms in timelyrelationship for driving the shuttle back and forth through the shed andfor timely transferring the shuttle from the transferring arm to thereceiving arm, the improvement wherein the drive mechanism comprises arotatable reel, a flexible band forming the drive arm wound onto thereel and adapted to be extended into the shed by rotation of the reel inone angular direction and to be withdrawn from the shed by rotation ofthe reel in the opposite angular direction, and wherein the drive meansprovides for rotating the reels in synchronism for driving the shuttleback and forth through the shed of the loom; wherein the loom has aframe, a lay pivotally mounted on the frame about an axis extendingtransversely of the shed of the loom, a first transversely extendingshaft mounted on the frame and connected for oscillating the lay backand forth for each revolution of the first shaft, and a secondtransversely extending shaft mounted on the frame and connected to bedriven at one-half the rotary speed of the first shaft; wherein theshuttle drive mechanisms are mounted on the lay for pivotal movementtherewith; and wherein the drive means for rotating the reel comprisesfirst rotary means connected for rotating and reciprocating the reel,second rotary means mounted on the frame, third rotary means mounted atthe pivotal axis of the lay, a drive element connecting the first andsecond rotary means and extending about the third rotary means, a leverpivotally mounted on the frame and connected to the drive elementbetween said second and third rotary means, cam means on said secondshaft and a cam follower mounted on the lever for operative engagementwith the cam means for reciprocating the drive element and therebyrotate and reciprocate the reel in timely relationship with the pivotalmovement of the lay.

6. In the loom of claim wherein the cam means comprises a replaceablecam having different cam portions for extending and withdrawing thedrive arm when the drive arm functions as a transferring arm and as areceiving arm respectively.

7. In a loom having a pair of transversely spaced shuttle drivemechanisms with transversely extending drive arms adapted for beingreciprocated for extension into and for withdrawal from the shed of theloom to drive a shuttle back and forth through the shed, the armsfunctioning alternately as shuttle transferring and shuttle receivingarms for transferring the shuttle back and forth therebetween as theyare reciprocated, the arms having shuttle connectors on the ends thereoffor driving the shuttle through the shed, the improvement wherein theshuttle connector comprises an end pocket for receiving the end of theshuttle, a pivotal latch pawl having a first latching arm for latchingthe shuttle within the pocket and a second actuator arm, said latch pawlhaving an extended position for receiving the end of the shuttle as itis received within the connector pocket and a withdrawn position forholding the shuttle within the pocket, spring means for retaining thelatch pawl in its extended position, electromagnet means for holding thelatch pawl in its withdrawn position, and switching means for timelyde-energizing and energizing the electromagnet means of the transferringand receiving arms to provide for transferring the shuttle therebetween.

8. The improvement of claim 7 wherein the switching means provides forde-energizing and energizing the electromagnet means of the transferringand receiving arms respectively prior to the time of the transfer of theshuttle between the arms, wherein the pivotal latch pawl is retained inits extended position by the spring means even though the electromagnetmeans of the connector is energized, and wherein the shuttle engages thelatching arm of the latch pawl as the shuttle enters the connectorpocket to pivot the latch pawl from its extended position to itswithdrawn position.

9. In a loom having a pair of transversely spaced shuttle drivemechanisms with transversely extending drive arms adapted for beingreciprocated for extension into and withdrawal from the shed of the loomto drive a shuttle back and forth through the shed, the arms functioningalternately as shuttle transferring and shuttle receiving arms fortransferring the shuttle back and forth therebetween as they arereciprocated, and drive means for reciprocating the arms in timelyrelationship for driving the shuttle back and forth through the shed andfor timely transferring the shuttle from the transferring arm to thereceiving arm, the improvement wherein the drive mechanism comprises arotatable reel, a flexible band forming the drive arm wound onto thereel and adapted to be extended into the shed by rotation of the reel inone. angular direction and to be withdrawn from the shed by rotation ofthe reel in the opposite angular direction, and wherein the drive meansprovides for rotating the reels in synchronism for driving the shuttleback and forth through the shed of the loom; wherein the shuttle drivemechanism comprises a second reel mounted in contiguous parallelassociation with the first mentioned reel and connected for rotationtherewith, a retainer band connected to the first and second reels andmounted in overlapping association with the flexible band for assistingin extending the flexible band into the shed and for winding theflexible band tightly onto the first reel, the second reel being adaptedto helically wind the retainer band thereon and being connected toaxially reciprocate in synchronism with the first reel.

10. In a loom having a frame, a lay pivotally mounted on the frame abouta transversely extending axis, a pair of transversely spaced weft feedmechanisms with transversely extending arms adapted for beingreciprocated for extension into and withdrawal from the shed of the loomfor transferring weft thread therebetween, and drive means forreciprocating the arms in timely relationship for feeding the weftthread through the shed and for timely transferring the weft thread fromthe transferring arm to the receiving arm, the improvement wherein thedrive means provides for reciprocating the arms so that the receivingarm has previously reached its fully extended position and is beingwithdrawn and the transferring arm is still being extended as the weftthread is transferred therebetween; wherein the weft feed mechanisms aremounted on the lay for pivotal movement therewith, wherein the feedmechanism comprises a rotatable reel, a flexible band forming thetransversely extending arm wound onto the reel and adapted to beextended into the shed by rotation of the reel in one angular directionand to be withdrawn from the shed by rotation of the reel in theopposite angular direction; and wherein the drive means comprises firstrotary means connected for rotating the reel, second rotary meansmounted on the frame, third rotary means mounted at the pivotal axis ofthe lay, a drive element connecting the first and second rotary meansand extending about the third rotary means, a lever pivotally mounted onthe frame and connected to the drive element between said second andthird rotary means, rotary cam means mounted on the frame connected tobe driven in timely relationship with the pivotal movement of the lay,and a cam follower mounted on the lever for operative engagement withthe cam means for reciprocating the endless drive element and therebyrotate the reel in timely relationship with the pivotal movement of thelay.

11. In the loom of claim 10 wherein the cam means comprises a cam havingdifferent cam portions for extending and withdrawing the arms inaccordance with their functions as transferring and receiving arms.

12. In the loom of claim 10 wherein the transversely extending armsfunction alternately as weft transferring and receiving armsrespectively for transferring the weft thread back and forththerebetween as the arms are reciprocated, and wherein the drive meanscomprises rotary cam means connected to be rotated one revolution forReferences Cited UNITED STATES PATENTS Eisenhart 139-141 Rurnsey 139-141Day et a1. 139-441 10 Kintzing 139-141 10 4/1924 Lambert et a1. 2139-441 4/1927 Lucas 139141 6/1932 Dickie et a1. 139141 X 12/1954 Berkowitz 139141 X FOREIGN PATENTS 2/1945 Switzerland. 2/1929 Great Britain.

MERVIN STEIN, Primary Examiner.

J. KEE CHI, Assistant Examiner.

